CN220894408U - Distribution network capacitance current testing device under on-line working condition of arc suppression coil - Google Patents
Distribution network capacitance current testing device under on-line working condition of arc suppression coil Download PDFInfo
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- CN220894408U CN220894408U CN202322450558.7U CN202322450558U CN220894408U CN 220894408 U CN220894408 U CN 220894408U CN 202322450558 U CN202322450558 U CN 202322450558U CN 220894408 U CN220894408 U CN 220894408U
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- 230000001629 suppression Effects 0.000 title claims abstract description 38
- 238000012360 testing method Methods 0.000 title claims abstract description 35
- 238000005070 sampling Methods 0.000 claims abstract description 52
- 230000003993 interaction Effects 0.000 claims abstract description 26
- 238000004891 communication Methods 0.000 claims abstract description 11
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 claims description 3
- 229910052744 lithium Inorganic materials 0.000 claims description 3
- 230000007935 neutral effect Effects 0.000 abstract description 16
- 238000005259 measurement Methods 0.000 abstract description 12
- 239000003990 capacitor Substances 0.000 abstract description 6
- 238000000034 method Methods 0.000 description 7
- 238000002347 injection Methods 0.000 description 4
- 239000007924 injection Substances 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- 239000000243 solution Substances 0.000 description 3
- 230000006378 damage Effects 0.000 description 2
- 208000027418 Wounds and injury Diseases 0.000 description 1
- 230000008033 biological extinction Effects 0.000 description 1
- 230000033228 biological regulation Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 208000014674 injury Diseases 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
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Abstract
The utility model discloses a power distribution network capacitance current testing device under an on-line working condition of an arc suppression coil, which comprises a sampling and control circuit board, a signal source circuit board, a single-phase transformer, a power module, a wiring terminal module and a man-machine interaction terminal, wherein the sampling and control circuit board is connected with the signal source circuit board; the sampling and control circuit board, the signal source circuit board and the low-voltage end of the single-phase transformer are sequentially connected, the high-voltage end of the single-phase transformer is connected with the wiring terminal module, and the power module supplies power for the sampling and control circuit board and the signal source circuit board; the sampling and control circuit board is also connected with the high-voltage end of the single-phase transformer and is used for collecting voltage and current; the sampling and control circuit board is in communication connection with the man-machine interaction terminal. The device does not need an arc suppression coil to exit from operation during test, so that the flow is simplified; the device directly injects signals to the neutral point of the grounding transformer or the neutral point led out by the compensation capacitor, has lower requirements on external equipment, and improves the measurement accuracy; the power distribution network can isolate users from high voltage, and personal safety is guaranteed.
Description
Technical Field
The utility model relates to the technical field of detection of capacitance to ground of a medium-voltage distribution network (including a neutral point grounded and a medium-voltage distribution network which is not grounded), in particular to a capacitance and current testing device of the distribution network under an on-line working condition of an arc suppression coil.
Background
With further implementation of national new energy policies, the power consumption level of China is further improved, and the load on the power grid is further increased. Because the ground capacitance exists in the power grid, the ground capacitance is gradually increased due to the fact that the ground capacitance is increased due to the fact that the ground cable is replaced by the longer and longer power grid laying distance and more ground cables. If the power grid has a ground fault, a larger capacitance current flows through the power grid during the fault period because of the capacitance of the power grid to the ground, so that the burden of the power grid is increased, and safety accidents such as equipment damage, fire disaster, personal injury and the like are easily generated. Therefore, the power regulations in China prescribe that when the capacitance current of the 10kV and 35kV systems is larger than 10A, arc suppression coils are arranged to compensate the capacitance current. At present, most of the power distribution network systems in China adopt a mode that a neutral point is grounded through an arc suppression coil to conduct arc extinction, so that transient grounding faults can be automatically eliminated, temporary safe operation of a power system is guaranteed, and more fault maintenance time is given.
The current commonly used method for measuring the capacitance to ground of the distribution network is a different-frequency injection method, namely, a different-frequency signal is injected into an open triangular end of a transformer or a current signal is injected into the transformer through a single-phase transformer after a neutral point is led out through a grounding transformer, and the injection method generally adopts a double-frequency method and a three-frequency method. In the actual measurement, certain errors and fluctuation of power grid parameters are inevitably introduced due to the connection of the transformer, and larger errors exist in the measurement result. And because the arc suppression coil is generally required to be withdrawn in the measuring process, the step of withdrawing the arc suppression coil is complex, and great inconvenience is brought.
Disclosure of utility model
Aiming at the defects in the prior art, the utility model provides a power distribution network capacitance current testing device under the online working condition of an arc suppression coil, which solves the problems of large measurement error and complex operation.
In order to achieve the above purpose, the present utility model adopts the following technical scheme:
The utility model provides a distribution network electric capacity electric current testing arrangement under arc suppression coil online operating mode, includes sampling and control circuit board, signal source circuit board, single-phase transformer, power module, binding post module, man-machine interaction terminal;
The sampling and control circuit board, the signal source circuit board and the low-voltage end of the single-phase transformer are sequentially connected, the high-voltage end of the single-phase transformer is connected with the wiring terminal module, and the power supply module supplies power for the sampling and control circuit board and the signal source circuit board; the sampling and control circuit board is also connected with the high-voltage end of the single-phase transformer and is used for collecting the voltage and the current of the high-voltage end of the single-phase transformer;
and the sampling and control circuit board is in communication connection with the man-machine interaction terminal.
Further, the sampling and control circuit board comprises a control unit, and a current sampling unit and a voltage sampling unit which are connected with the control unit.
Further, the sampling and control circuit board is connected with the man-machine interaction terminal in a wireless communication mode.
Further, the sampling and control circuit board is in communication with the man-machine interaction terminal through wireless Bluetooth.
Further, the man-machine interaction terminal adopts a mobile terminal.
Further, the terminal module includes a high voltage terminal and a ground terminal.
Further, the sampling and control circuit board is vertically and fixedly connected with the signal source circuit board through an inter-board connecting piece.
Further, the power supply module also comprises a power switch for controlling the on-off of the power supply module.
Further, the power module is a rechargeable lithium battery.
Further, the device comprises a device box body, wherein the sampling and control circuit board, the signal source circuit board, the single-phase transformer and the power module are arranged in the device box body, and the wiring terminal module is arranged on the device box body.
The working principle of the power distribution network capacitance current testing device under the on-line working condition of the arc suppression coil provided by the utility model is as follows: firstly, setting relevant working condition parameters of a power distribution network to be measured on a man-machine interaction terminal by a professional, simultaneously connecting a neutral point of a grounding transformer or a neutral point of a compensation capacitor of the power distribution network to a wiring terminal module, and then starting measurement; during measurement, the man-machine interaction terminal sends a control instruction to the sampling and control circuit board, the sampling and control circuit board sends a corresponding control signal to the signal source circuit board after receiving the control instruction, and then the signal source circuit board generates a current signal with required characteristic frequency and amplitude of the measurement; meanwhile, the sampling and control circuit board samples voltage and current data of the high-voltage end of the single-phase transformer, then calculates a capacitance to ground value and a capacitance to ground value of the power distribution network according to the collected data, and transmits the capacitance to the man-machine interaction terminal for display.
The power distribution network capacitance current testing device under the on-line working condition of the arc suppression coil has the following advantages:
(1) If single-phase grounding faults occur when the arc suppression coil is out of operation, major safety accidents of a power grid can be possibly caused, and the device avoids the problem that the arc suppression coil is required to be out of operation when the existing capacitance current testing device works.
(2) The device does not need an arc suppression coil to exit from running during testing, simplifies the testing process, shortens the testing time and reduces the influence on the normal running of the power grid.
(3) The device is applied to an automatic tuning arc suppression coil system, solves the problem that the capacitance current of the existing arc suppression coil system is accurately measured, and realizes ideal compensation of the capacitance current of the system.
(4) The device is compact and portable as a whole, the interface of the wiring board is concise, and the operation is convenient for a user. Meanwhile, the mobile terminal is adopted as a matched man-machine interaction terminal, when the power distribution network is in actual use on site, the testing main body part is connected with the power distribution network, and a user can hold the man-machine interaction terminal away from the testing main body part to realize all operation, so that the power distribution network of the user and high voltage is isolated, and the personal safety is practically ensured.
(5) The signal injection position of the device does not depend on the low-voltage end of the arc suppression coil device, but directly injects signals to the neutral point of the grounding transformer or the neutral point led out by the compensation capacitor, and the requirement on external equipment is low.
Drawings
In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described, it being obvious that the drawings in the following description are only some embodiments of the utility model, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic diagram of a capacitive current testing device of a power distribution network under an on-line working condition of an arc suppression coil provided by an embodiment of the utility model;
Fig. 2 is a schematic diagram of a resonant grounded power distribution network and a testing device according to an embodiment of the present utility model.
Detailed Description
In order to make the objects, technical solutions and advantages of the present utility model more apparent, the technical solutions of the present utility model will be described in detail below. It will be apparent that the described embodiments are only some, but not all, embodiments of the utility model. All other embodiments, based on the examples herein, which are within the scope of the utility model as defined by the claims, will be within the scope of the utility model as defined by the claims.
In the description of the present utility model, it should be understood that the terms "upper," "lower," "top," "bottom," "inner," "outer," "vertical," "horizontal," and the like indicate orientations or positional relationships based on the orientation or positional relationships shown in the drawings, merely to facilitate describing the present utility model and simplify the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present utility model. When an element is referred to as being "mounted" on another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present.
As shown in fig. 1, the embodiment provides a capacitance and current testing device for a power distribution network under an on-line working condition of an arc suppression coil, which comprises a sampling and control circuit board 1, a signal source circuit board 3, a single-phase transformer 4, a power supply module 5, a wiring terminal module and a man-machine interaction terminal 6;
The sampling and control circuit board 1, the signal source circuit board 3 and the low-voltage end of the single-phase transformer 4 are sequentially connected, the high-voltage end of the single-phase transformer 4 is connected with the wiring terminal module, and the power module 5 supplies power for the sampling and control circuit board 1 and the signal source circuit board 3; the sampling and control circuit board 1 is also connected with the high-voltage end of the single-phase transformer 4 and is used for collecting the voltage and the current of the high-voltage end of the single-phase transformer 4;
The sampling and control circuit board 1 is in communication connection with the man-machine interaction terminal 6.
The working principle of the power distribution network capacitance current testing device under the online working condition of the arc suppression coil provided by the embodiment is as follows: firstly, professional personnel sets relevant working condition parameters of a power distribution network to be measured on a man-machine interaction terminal 6, wherein the relevant working condition parameters comprise power distribution network voltage levels (6 KV,10KV and 35 KV), bus section numbers, measurement interface modes (a compensating capacitor neutral point and a grounding transformer neutral point), arc suppression coil working conditions (whether an arc suppression coil is carried or not) and the like, and meanwhile, the power distribution network grounding transformer neutral point or the compensating capacitor neutral point is connected with a wiring terminal module, as shown in fig. 2, an embodiment of connecting the power distribution network grounding transformer neutral point with the wiring terminal module is shown, a dotted line frame in the figure is a model schematic diagram of a testing device, and then measurement is started; during measurement, the man-machine interaction terminal 6 sends a control instruction to the sampling and control circuit board 1, the sampling and control circuit board 1 receives the control instruction and then sends a corresponding control signal to the signal source circuit board 3, and then the signal source circuit board 3 generates a current signal with required characteristic frequency and amplitude of the measurement; meanwhile, the sampling and control circuit board 1 samples voltage and current data of the high-voltage end of the single-phase transformer 4, then calculates a capacitance to ground value and a capacitance to ground value of the power distribution network according to the acquired data, and transmits the capacitance to the man-machine interaction terminal 6 for display. The calculation of the capacitance to ground and the current to ground according to the sampled data is known in the art, and will not be described here.
The device does not need an arc suppression coil to exit from running during testing, so that the testing flow is simplified, the testing time is shortened, and the influence on the normal running of a power grid is reduced; the device is applied to an automatic tuning arc suppression coil system, solves the problem of low accuracy in measurement of the capacitance current of the existing arc suppression coil system, and realizes ideal compensation of the capacitance current of the system; the signal injection position of the device does not depend on the low-voltage end of the arc suppression coil device, but directly injects signals to the neutral point of the grounding transformer or the neutral point led out by the compensation capacitor, and the requirement on external equipment is low.
Specifically, the sampling and control circuit board 1 comprises a control unit, and a current sampling unit and a voltage sampling unit which are connected with the control unit. The current sampling unit is used for sampling current data of the high-voltage end of the single-phase transformer 4, and the voltage sampling unit is used for sampling voltage data of the high-voltage end of the single-phase transformer 4.
In some preferred embodiments, the sampling and control circuit board 1 is connected with the man-machine interaction terminal 6 in a wireless communication manner. When the power distribution network is actually used in the field, the testing main body part is connected with the power distribution network, and a user can hold the man-machine interaction terminal 6 away from the testing main body part to realize all operation, so that the power distribution network of the user and high voltage is isolated, and the personal safety is practically ensured.
In this embodiment, the sampling and control circuit board 1 communicates with the man-machine interaction terminal 6 through wireless bluetooth, and in other embodiments, wireless communication can be realized through a communication module such as 4G/5G. In implementation, the man-machine interaction terminal 6 is preferably a mobile terminal, which may be a tablet computer, a notebook computer, a mobile phone, or the like.
In this embodiment, the terminal module includes a high voltage terminal 7 and a ground terminal 8. The sampling and control circuit board 1 is vertically and fixedly connected with the signal source circuit board 3 through an inter-board connecting piece 2. The inter-plate connection 2, in addition to its fixing function, also serves as a signal transmission and energy supply function.
In this embodiment, the power supply device further includes a power switch 9, which is configured to control on/off of power supplied by the power module 5. The power module 5 is a rechargeable lithium battery, the power module 5 is connected with the signal source circuit board 3, and the energy supply of the whole device is finally realized through the inter-board connecting piece 2. The device is also provided with a device charging port 10 connected with the power module 5, the device charging port 10 is a charging female head, and an external charger can be connected to charge the power module 5.
When the device is implemented, the device further comprises a device box body, wherein the sampling and control circuit board 1, the signal source circuit board 3, the single-phase transformer 4 and the power module 5 are arranged in the device box body, and the wiring terminal module, the power switch 9 and the device charging port 10 are arranged on the device box body. The device case can protect the internal components, and the device case can be optionally composed of a case body 11 and a case cover 12.
While embodiments of the present utility model have been shown and described above, it will be understood that the above embodiments are illustrative and not to be construed as limiting the utility model, and that variations, modifications, alternatives and variations may be made to the above embodiments by one of ordinary skill in the art within the scope of the utility model.
Claims (10)
1. The power distribution network capacitance current testing device under the online working condition of the arc suppression coil is characterized by comprising a sampling and control circuit board, a signal source circuit board, a single-phase transformer, a power supply module, a wiring terminal module and a man-machine interaction terminal;
The sampling and control circuit board, the signal source circuit board and the low-voltage end of the single-phase transformer are sequentially connected, the high-voltage end of the single-phase transformer is connected with the wiring terminal module, and the power supply module supplies power for the sampling and control circuit board and the signal source circuit board; the sampling and control circuit board is also connected with the high-voltage end of the single-phase transformer and is used for collecting the voltage and the current of the high-voltage end of the single-phase transformer;
and the sampling and control circuit board is in communication connection with the man-machine interaction terminal.
2. The device for testing the capacitance and the current of the power distribution network under the on-line working condition of the arc suppression coil according to claim 1, wherein the sampling and control circuit board comprises a control unit, and a current sampling unit and a voltage sampling unit which are connected with the control unit.
3. The device for testing the capacitance and the current of the power distribution network under the on-line working condition of the arc suppression coil according to claim 1, wherein the sampling and control circuit board is connected with the man-machine interaction terminal in a wireless communication mode.
4. The device for testing capacitance and current of the power distribution network under the on-line working condition of the arc suppression coil according to claim 1, wherein the sampling and control circuit board and the man-machine interaction terminal are in wireless Bluetooth communication.
5. The power distribution network capacitance and current testing device under the on-line working condition of the arc suppression coil according to claim 1, wherein the man-machine interaction terminal adopts a mobile terminal.
6. The device for testing capacitance and current of a power distribution network under on-line working conditions of an arc suppression coil according to claim 1, wherein the wiring terminal module comprises a high-voltage wiring terminal and a ground wiring terminal.
7. The device for testing capacitance and current of a power distribution network under the on-line working condition of an arc suppression coil according to claim 1, wherein the sampling and control circuit board is vertically and fixedly connected with the signal source circuit board through an inter-board connecting piece.
8. The device for testing the capacitance and the current of the power distribution network under the on-line working condition of the arc suppression coil according to claim 1, further comprising a power switch for controlling the on-off of the power supply module.
9. The device for testing capacitance and current of a power distribution network under on-line working conditions of arc suppression coils according to claim 1, wherein the power supply module is a rechargeable lithium battery.
10. The device for testing capacitance and current of a power distribution network under on-line working conditions of an arc suppression coil according to any one of claims 1 to 9, further comprising a device box, wherein the sampling and control circuit board, the signal source circuit board, the single-phase transformer and the power module are all arranged in the device box, and the terminal submodule is arranged on the device box.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202322450558.7U CN220894408U (en) | 2023-09-11 | 2023-09-11 | Distribution network capacitance current testing device under on-line working condition of arc suppression coil |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202322450558.7U CN220894408U (en) | 2023-09-11 | 2023-09-11 | Distribution network capacitance current testing device under on-line working condition of arc suppression coil |
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| Publication Number | Publication Date |
|---|---|
| CN220894408U true CN220894408U (en) | 2024-05-03 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202322450558.7U Active CN220894408U (en) | 2023-09-11 | 2023-09-11 | Distribution network capacitance current testing device under on-line working condition of arc suppression coil |
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| Country | Link |
|---|---|
| CN (1) | CN220894408U (en) |
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2023
- 2023-09-11 CN CN202322450558.7U patent/CN220894408U/en active Active
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